I was out and about a feew months ago (off roading) and my oil pressure dropped down to 0, and returned to normal after I started moving. Recently, the pressure is dropping down to 0 and then up to about 20 every time i put it in eutral... Any ideas why? I have checked the oil level, and it is fine

my TJ did that with the stock pressure guage. If it was really at 0, you'd hear it. Electric guages take a moment to respond and are not very acurate. Don't worry about it, or hang a mech. one on.